Solar cell



FIG. 1 is a perspective view of front, top and right side of a solar cell showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view, a right side view being a mirror image thereof;

FIG. 5 is a top view, a bottom view being a mirror image thereof;

FIG. 6 is an enlarged left side view thereof, taken along line 6-6 of FIG. 4;

FIG. 7 is an enlarged top view thereof, taken along line 7-7 of FIG. 5; and,

FIG. 8 is a front view thereof, shown in environmental use.

The broken lines show unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a solar cell, as shown and described. 